Incredible 2006 Toyota Prius Problems Master Warning Light Exclamation Check Engine Ideas. The most common cause of this light coming on is a low battery. Web i have difficulty conceiving of a transmission problem that goes bad but is ok after resetting the warning light.

If not, the pump has failed and the inverter is overheating. Some of the time, though, the oil pressure warning light would be present. Indicates a problem with the hybrid system, which could affect the car’s fuel.